Follow along at https://www.hackingwithswift.com/100/41.
This day resolves around recapping the content covered while going through Projects 7-9 in Hacking with Swift, and then implementing a challenge project. Regarding the recap, I won't try to rehash what I wrote up already — but there is one thing that bears repeating: Always update the UI on the main thread 🙂.
From https://www.hackingwithswift.com/guide/4/3/challenge:
Make a hangman game using UIKit.
Hanging people seems a bit barbaric, so instead, I came up with Hangmannequin. Feel free to peruse the finished project here. In the meantime... a few screenshots: